No, in the 7-book series, Harry never got drunk and talked to a cat.
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Yes, there are several cats in Harry Potter. Mrs Norris and Crookshanks being just two.
There is no janitor in Harry Potter at any time.
Yes, in Harry Potter and the Prisoner of Askaban, J.K Rowling introduces Crookshanks, Hermione's ginger cat, into the series.
Crookshanks (Hermione Granger's cat from the Harry Potter series), featured mainly in Harry Potter and the Prisoner of Azkaban, is a male. If you read Harry Potter and the Prisoner of Azkaban, Hermione always refers to Crookshanks as 'he'.
Professor McGonagall is the transfiguration professor at Hogwarts and can turn into a cat. She doesn't follow Harry around though, the cat that does that is Filch the caretakers cat Mrs Norris, who is not a transfigured human.
If you mean Mr. Filch, the creepy caretaker who has a cat named Mrs. Norris, then this is your answer: Argus Filch is played by David Bradley in the Harry Potter Films